Impact-induced twinning in a magnesium alloy under different stress conditions

Y. Y. Zhang, Y. F. Xu, Z. D. Feng, T. Sun, K. Fezzaa, M. X. Tang*, S. Chen*, S. N. Luo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We investigate deformation twinning in a highly textured magnesium alloy plate of Mg-3.1%Al-0.9%Zn-0.4%Mn under edge-on impact with in situ, synchrotron-based, ultrafast X-ray diffraction measurements, and corresponding stress states are simulated with the finite element method. Deformation twinning and its anisotropy under the triaxial stress condition are explained by a statistical analysis of resolved shear stress. The critical resolved shear stress criterion is applicable under complicated stress conditions induced by high strain rate impact loading. Three typical simple stress conditions are further explored as verification and application cases: uniaxial-stress, uniaxial-strain, and plane-stress. Extension twinning in the magnesium alloy is prone to occur for impact loading applied perpendicular to the crystallographic c-axis, regardless of the exact stress conditions.

Original languageEnglish (US)
Article number141360
JournalMaterials Science and Engineering: A
Volume818
DOIs
StatePublished - Jun 22 2021

Funding

This work was sponsored in part by the Scientific Challenge Project of China (Grant No. TZ2018001 ) and the National Natural Science Foundation of China (Grant Nos. 11627901 and 11902274 ). Use of the Advanced Photon Source, an Office of Science User Facility operated for the US Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the US DOE under Contract No. DE-AC02-06CH11357 .

Keywords

  • Deformation twinning
  • Impact loading
  • Magnesium alloys
  • Resolved shear stress
  • Transient X-ray diffraction

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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